EP0433479A1 - Bürstenloser Gleichstrommotor und zugehöriger Rotormagnet - Google Patents
Bürstenloser Gleichstrommotor und zugehöriger Rotormagnet Download PDFInfo
- Publication number
- EP0433479A1 EP0433479A1 EP89123525A EP89123525A EP0433479A1 EP 0433479 A1 EP0433479 A1 EP 0433479A1 EP 89123525 A EP89123525 A EP 89123525A EP 89123525 A EP89123525 A EP 89123525A EP 0433479 A1 EP0433479 A1 EP 0433479A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotor
- magnet
- stator
- rotor magnet
- motor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2786—Outer rotors
- H02K1/2787—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/2789—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2791—Surface mounted magnets; Inset magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
- H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors
Definitions
- the present invention relates to a brushless DC motor comprising a stator having magnetic poles with coils and inter-poles, a rotor magnet of cylindrical shape radially magnetized having magnetic grooves on its inner surface facing the stator, and a rotor position sensor, and to said rotor magnet used in said brushless DC motor.
- a brushless DC motor of the prior art construction enjoys stable motor driving torque and small detent torque but has the following disadvantages: - Special magnetic pattern of the rotor magnet makes it difficult to mass-produce motors of uniform characteristics.
- the prior art requires non-magnetized areas to be formed on the rotor magnet, and for this purpose, requires a special yoke-shaped magnetizing head. Also the difference in magnetizing devices (magnetization power supply, magnetization voltage, electrostatic capacity of power supply, etc.) or changes of surrounding temperature cause an uneven space distribution of magnetic flux density.
- the entire rotor magnet is completely magnetized without having any non-magnetized area, and the stator has magnetic grooves in its opposing surface. Because of this, if the rotor magnet and the stator are assembled into a motor, the desired space magnetic flux density is obtained by changing its permeance in a circumferential direction.
- the stator with interpoles and the rotor magnet with a specific space magnetic flux density are combined to produce torque at any position of the rotor and to ensure stable starting.
- FIG 1 is a principle view of the brushless DC motor related to this Invention and an example of 4-pole outer-rotor-type motor. As our basic views on the stator section are almost the same as those on the conventional technology shown in Figure 10, its corresponding parts are shown in identical symbols for easy reference.
- the magnetic grooves are formed so as to give magnetic changes in a circumferential direction
- the rotor magnet is so constructed that its whole can be magnetized without having any non-magnetized area, and this does not require to distinguish a rotor main magnet from a rotor position detective magnet.
- interpoles 5ab, 5bc, 5cd and 5da function as a generator of torque (no dead point) at any positions of the rotor.
- magnetizing converter 6 detects the changes of the magnetic poles in rotor magnet 6 and energizes a pair of coils 4a and 4c, and a pair of coils 4b and 4d alternatively. This causes the rotor to rotate continuously in one direction.
- Fig.4 shows the fan motor.
- Fig.4 has a reference number marked in common with Fig.1 for easy explanation of the motor section.
- Impeller 40 molded in one piece with synthetic resin, has in the inner side the Rotor Yoke 10 which is heat-clinched and fastened.
- Rotor shaft 18 is free to rotate in Bearings 44 and 45 fitted into the housing 42, and is held in position with a retaining ring 48 after a spring 46 is adjusted to a given preload.
- Circuit board 50 is fastened with screw 51 to the inner side of housing 42.
- a logic circuit for coil excitation conversion, switching elements and magnetizing converter 6 for rotor position sensor etc. are mounted on the circuit board 50, to which the terminal of each coil 4a,..4d is also connected.
- the required power is supplied from the outside source with wire 52.
- a groove cut in the rotor magnet is not limited to a single shape of rectangle on sectional view.There may be other different shapes such as A ⁇ E on Fig.5.
- the rotor magnet structure is also possible to change. Fig.6 and Fig.7 account for it.
- the rotor magnet may be made up of a high performance magnet such as a sisntered or a rare-earth magnet. If they would be used for a whole of the rotor magnet, however, it would be costly, far from cost-effective in many cases.
- the groove cut in the rotor magnet is so narrow that a degree of intensity becomes slight and the transformation may easily occur. Attention should be paid to handling it.
- Fig.7 is a structure designed for the intensity to become greater with proper reinforcement material 53 filled up in the grooved part of the rotor magnet 54.
- non-magnetic plastics serve the purpose of reinforcement 53.
- plastic magnets are adaptable as reinforcement 53 for the rotor magnet 54 in which high performance magnets such as sintered or rare-earth magnet are used.
- Fig.8 and Fig.9 show a practical structure of the rotor. If the impeller must be joined with the rotor like a fan-motor for instance, it should be designed to make a combination of rotor magnet 56, shaft 55 and reinforcement 57(impeller for fan-motor) in a complete form and unit, as Fig.8.
- This invention is applicable to a photoelectro-type rotor position sensor system in addition to a magnetizing converter aided rotor position sensor system.
- This invention shows that the rotor magnet is entirely magnetized without non-magnetized area, does not require any magnetizing head in a special yoke-shape accordingly,and facilitates in designing the jig, and nearly eliminates the unsteadiness resulting from magnetization power supply, magnetization voltage, electrostatic capacity etc.,and provides for more steady space distribution of magnetic flux density. And, some proper change in thickness or space gap of the rotor magnet allows for free space distribution of magnetic flux density.
- the electric current falls during the operating time so that the high efficiency is gained and the temperature can be kept from going up. It contributes to the material cost reduction because the rotor magnet can be made smaller in capacity to have the same functional performance capability as the previous type. Moreover, it helps to cut back the cogging torque.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Brushless Motors (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1989624168 DE68924168T2 (de) | 1989-12-20 | 1989-12-20 | Bürstenloser Gleichstrommotor und zugehöriger Rotormagnet. |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63151005A JPH0817544B2 (ja) | 1988-06-18 | 1988-06-18 | ブラシレスdcモータ |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0433479A1 true EP0433479A1 (de) | 1991-06-26 |
EP0433479B1 EP0433479B1 (de) | 1995-09-06 |
Family
ID=15509208
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP89123525A Expired - Lifetime EP0433479B1 (de) | 1988-06-18 | 1989-12-20 | Bürstenloser Gleichstrommotor und zugehöriger Rotormagnet |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0433479B1 (de) |
JP (1) | JPH0817544B2 (de) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1996022629A2 (en) * | 1995-01-20 | 1996-07-25 | Automotive Motion Technology Limited | Brushless dc motors |
EP0748032A2 (de) * | 1995-06-07 | 1996-12-11 | Minebea Co.,Ltd. | Anordnung eines Motors |
EP0801455A2 (de) * | 1996-04-08 | 1997-10-15 | Minebea Co., Ltd. | Zweiphasiger unipolar betriebener bürstenloser Gleichstrommotor |
US5852335A (en) * | 1995-04-26 | 1998-12-22 | Mineba Ceo., Ltd. | Stator structure for rotary electric machine |
WO1999025057A1 (fr) * | 1997-11-06 | 1999-05-20 | Super Whell & Battery Antriebstechnik Gmbh | Moteur electrique pour roue a moteur |
WO2003092143A1 (de) * | 2002-04-24 | 2003-11-06 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Antrieb mit permanentmagneterregung |
US7119468B2 (en) | 2003-09-04 | 2006-10-10 | Ultra Motor Company Limited | Electric motor |
DE102009013374A1 (de) * | 2009-03-07 | 2010-09-09 | Ziehl-Abegg Ag | Rotor für Elektromotoren, Permanentmagnet für einen solchen Rotor sowie elektrische Maschine mit einem Rotor |
CN107925279A (zh) * | 2015-09-18 | 2018-04-17 | 爱信艾达株式会社 | 旋转电机和定子 |
CN112510952A (zh) * | 2020-11-25 | 2021-03-16 | 哈尔滨工业大学 | 基于磁场调制原理的横向错位无刷双转子电机 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3395071B2 (ja) * | 1996-04-25 | 2003-04-07 | ミネベア株式会社 | モータ構造 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2386928A1 (fr) * | 1977-04-08 | 1978-11-03 | Sony Corp | Moteur a courant continu |
DE3102492A1 (de) * | 1980-04-24 | 1981-12-03 | VEB Elektromotorenwerk Hartha, DDR 7302 Hartha | Ausfuehrung des magnetischen kreises von gleichstrommotoren mit elektronischer kommutierung |
DE3229458A1 (de) * | 1982-08-06 | 1984-02-09 | Ryoji Nerima Tokyo Minegishi | Geblaese mit motor |
DE3331194A1 (de) * | 1983-08-30 | 1985-03-07 | Ebm Elektrobau Mulfingen Gmbh & Co, 7119 Mulfingen | Kollektorloser gleichstrommotor mit dreistraengiger, ungesehnter statorwicklung |
US4549104A (en) * | 1982-12-07 | 1985-10-22 | Sanyo Denki Co., Ltd. | Motor of the permanent-magnet rotor type |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59170490A (ja) * | 1983-03-17 | 1984-09-26 | Matsushita Electric Ind Co Ltd | 電動送風機 |
JPS61164452A (ja) * | 1985-01-11 | 1986-07-25 | Secoh Giken Inc | 1相の突極型半導体電動機 |
JPS62126889A (ja) * | 1985-11-25 | 1987-06-09 | Ube Ind Ltd | 三相ブラシレスモ−タの制御方法及びその方法に用いるロ−タ |
JPS62115773U (de) * | 1986-01-10 | 1987-07-23 |
-
1988
- 1988-06-18 JP JP63151005A patent/JPH0817544B2/ja not_active Expired - Fee Related
-
1989
- 1989-12-20 EP EP89123525A patent/EP0433479B1/de not_active Expired - Lifetime
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2386928A1 (fr) * | 1977-04-08 | 1978-11-03 | Sony Corp | Moteur a courant continu |
DE3102492A1 (de) * | 1980-04-24 | 1981-12-03 | VEB Elektromotorenwerk Hartha, DDR 7302 Hartha | Ausfuehrung des magnetischen kreises von gleichstrommotoren mit elektronischer kommutierung |
DE3229458A1 (de) * | 1982-08-06 | 1984-02-09 | Ryoji Nerima Tokyo Minegishi | Geblaese mit motor |
US4549104A (en) * | 1982-12-07 | 1985-10-22 | Sanyo Denki Co., Ltd. | Motor of the permanent-magnet rotor type |
DE3331194A1 (de) * | 1983-08-30 | 1985-03-07 | Ebm Elektrobau Mulfingen Gmbh & Co, 7119 Mulfingen | Kollektorloser gleichstrommotor mit dreistraengiger, ungesehnter statorwicklung |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0848482A3 (de) * | 1995-01-20 | 1999-10-06 | Automotive Motion Technology Limited | Bürstenloser Gleichstrommotor |
WO1996022629A3 (en) * | 1995-01-20 | 1996-09-12 | Norcroft Dynamics Ltd | Brushless dc motors |
WO1996022629A2 (en) * | 1995-01-20 | 1996-07-25 | Automotive Motion Technology Limited | Brushless dc motors |
EP0848482A2 (de) * | 1995-01-20 | 1998-06-17 | Automotive Motion Technology Limited | Bürstenloser Gleichstrommotor |
US5986376A (en) * | 1995-01-20 | 1999-11-16 | Automotive Motion Technology Limited | Brushless DC motors |
US5852335A (en) * | 1995-04-26 | 1998-12-22 | Mineba Ceo., Ltd. | Stator structure for rotary electric machine |
EP0748032A2 (de) * | 1995-06-07 | 1996-12-11 | Minebea Co.,Ltd. | Anordnung eines Motors |
EP0748032A3 (de) * | 1995-06-07 | 1997-05-14 | Minebea Co Ltd | Anordnung eines Motors |
US6081058A (en) * | 1995-06-07 | 2000-06-27 | Minebea Co., Ltd. | Motor structure having a permanent magnet motor with grooves to reduce torque ripples |
EP0801455A3 (de) * | 1996-04-08 | 1997-12-17 | Minebea Co., Ltd. | Zweiphasiger unipolar betriebener bürstenloser Gleichstrommotor |
US5777415A (en) * | 1996-04-08 | 1998-07-07 | Minebea Co., Ltd. | Two-phase unipolar drive type brushless DC motor |
EP0801455A2 (de) * | 1996-04-08 | 1997-10-15 | Minebea Co., Ltd. | Zweiphasiger unipolar betriebener bürstenloser Gleichstrommotor |
WO1999025057A1 (fr) * | 1997-11-06 | 1999-05-20 | Super Whell & Battery Antriebstechnik Gmbh | Moteur electrique pour roue a moteur |
WO2003092143A1 (de) * | 2002-04-24 | 2003-11-06 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Antrieb mit permanentmagneterregung |
US7119468B2 (en) | 2003-09-04 | 2006-10-10 | Ultra Motor Company Limited | Electric motor |
DE102009013374A1 (de) * | 2009-03-07 | 2010-09-09 | Ziehl-Abegg Ag | Rotor für Elektromotoren, Permanentmagnet für einen solchen Rotor sowie elektrische Maschine mit einem Rotor |
CN107925279A (zh) * | 2015-09-18 | 2018-04-17 | 爱信艾达株式会社 | 旋转电机和定子 |
EP3312973A4 (de) * | 2015-09-18 | 2018-09-12 | Aisin AW Co., Ltd. | Rotierende elektrische maschine und stator |
US10958122B2 (en) | 2015-09-18 | 2021-03-23 | Aisin Aw Co., Ltd. | Rotating electrical machine and stator |
CN112510952A (zh) * | 2020-11-25 | 2021-03-16 | 哈尔滨工业大学 | 基于磁场调制原理的横向错位无刷双转子电机 |
CN112510952B (zh) * | 2020-11-25 | 2021-09-28 | 哈尔滨工业大学 | 基于磁场调制原理的横向错位无刷双转子电机 |
Also Published As
Publication number | Publication date |
---|---|
JPH01318536A (ja) | 1989-12-25 |
EP0433479B1 (de) | 1995-09-06 |
JPH0817544B2 (ja) | 1996-02-21 |
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